SINGCALL Wireless Calling System, Stable Signal, Long Distance to Receive, Nursing Calling, 1 Necklace Pager and 1 Watch Receiver, Home Caring Old People, Patients Children, Patrol Officers' Calling Need more watch receiver or necklace pager? Please search B00EC6P0K8 or B00V5X7VUS on Amazon. APE6600: 01.Directly receive signals of pager(s), convenient to take. Show the time when on standby mode. 02.With sleep mode, saving power and avoid disturbing when do not use. 03.Two prompt modes of vibration or beep, the length of vibration can be set from 1-5 seconds. 04.'Lock the watch' function, can aviod misoperation. 05.Frequently Asked Questions attached in the last page of manual, can solve most problems. APE160:01. Rounded and light, comfortable to wear 02. Dual hanging, easy to move Taking hang rope and suspension clasp as the wearing style, thus it could be hung around the neck or fastened on the waist. 03. Marked button, convenient to call Marked orange button makes the calling more convenient and it is not only fit for such kind of people, old, patients or children, but also suitable to patrol officers' calling. 04. Stable signal, long distance to receive Specifications:2.17*1.77*0.6 inches(55*45*18mm) Us Frequency Range:433MHZ Sound Type: Music/Vibration Standby Time:30 days long With Pager Quantity:999PCS Receiver Sensitivity:-114dbm Power Supply: AAA battery Size: 2.95*1.93*0.79in(75*49*20mm) Distance: 130-200ft indoors, 1600ft in the open air Coding scheme: Registration Battery: Alkaline Battery 12V/23A Frequency: 433 MHz Deviation: 0.5 MHz